THE chief suspect in the savage murder of teenager Marioara Rostas has been returned to prison after being quizzed by gardai for 24 hours.
SOURCES say gardai are now "very close" to building a strong case against the man, who is due to apply for bail.
After being questioned over the weekend at Pearse Street Garda Station, the suspect was returned to Cloverhill Prison, where he has been on remand in relation to gangland charges.
He has now spent well over six months on remand.
The man is also the chief suspect in the murder of Darren Cogan (22) in an Inchicore pub in June of last year as well as a spate of separate terrifying gang related crimes.
The Herald revealed last week that he is expected to attempt to get a release from prison by taking advantage of a ruling on a key piece of anti-crime legislation that has been used by gardai since 1939.
Last month, five Supreme Court judges, including Chief Justice Susan Denham, decided that a section of the Offences Against the State Act was "repugnant" to the Constitution.
The suspect had been previously arrested under this section of legislation.
Gardai received specific information last year that led to the discovery of the body of Marioara in the Dublin Mountains in January.
Seven people -- five men and two women -- have been arrested since the investigation into her disappearance began in January 2008.
The arrests were made in November 2008 and October 2009.
A number of these people including the chief suspect, his mother and sister were re-arrested last week as the net closed in on the twisted criminal who is closely linked to gangland serial killer Eric 'Lucky' Wilson.
The key breakthrough in the investigation happened last year and officers are confident of being able to press charges in the case.
Gardai have now renewed their appeals for two people who made anonymous phone calls to come forward -- these are a man who called Pearse Street Garda Station from Co Wexford in June 2008 and a woman who rang 999 in September, 2008.
Gardai have always worked on the theory that Marioara was shot dead in the upstairs room of a derelict house in Brabazon Street just days after being abducted as she begged on East Lombard Street on January 6, 2008.
After being abducted they believe the tragic teenager was savagely gang-raped at a number of locations.
The Brabazon Street property was later gutted in a fire, which was started by criminals in an attempt to destroy evidence.